Crossword Genius

Nowhere makes it harder to breathe (4,3)

Ross

I believe the answer is:

thin air

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(Other definitions for thin air that I've seen before include "impression of slimness" , "Nothingness into/from which things might magically (dis)appear" , "State of invisibility" , "Vanish into . . . . . . . - disappear completely" , "Vanish completely as into . . . . . . ., on high mountain?" .)

I've seen this clue in The Globe and Mail.
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